Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da768a76db1705c…

MALICIOUS

PDF

84.7 KB Created: 2021-08-22 04:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46127ef4df03935b089182227020e888 SHA-1: 2a2f6f44eb69efba689acd136d29e9b9e1875b74 SHA-256: 9da768a76db1705cbe7d4f48536024440f1839a67cf9834b3b9bfd698de9a8a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://php-lounge.de/userfiles/file/3482607847.pdf In PDF document text
    • http://saaretravel.ee/images/file/lotobefopuji.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/nepexedataxugamamupuji.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/wurumadotogunujibamezixar.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077502030360---15260312386.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vipetiroriga.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cde70c9bc---fasezuvoteriso.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/46306217755.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/73489536140.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072daf05ace1---50158635070.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f428b4a7---94350088996.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/nuwizigiburuzivomavagon.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/rufedobirelafeloz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c615031b923---sarabirubapebirop.pdfIn PDF document text
    • https://bdata.vn/upload/files/pixibagodeze.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160969de3e7e91---gerowewamojabusuvufut.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/73899541496.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a803104b2fb---wimugimabifupofu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2be6c32a---gufedufuwomezum.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094083e56e7f---98008619219.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/nilose.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/97fbee6105d3ddb438388d87845e9d7c/23954787171.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/sufekidoduzoma.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9224e31b07---beramotokakovu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/samopimosotivusat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=is+warcraft+2+worth+playingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 16868 bytes
SHA-256: 64407aafedd82af5b4bdd0247f4b23070a4763d771a0bbbb01a499fa5804f01b
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 10896 bytes
SHA-256: b3803a3107a28cc475a3bc98bf7a7be368f43a08856be106b199ec03a8860ecf